CCPS Process Safety Glossary

Inputs that accept on/off signals form limit switches, push buttons, and...

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The standard deviation s in a specified direction of the gaussian...

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óy (lateral component), óz (vertical component), and óx (along-wind...

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Mathematical models that characterize the transport of toxic/flammable...

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A scaling length that becomes important for describing the wind profile at...

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Recirculation zones adjacent to buildings or other obstacles where the flow...

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A chemical reaction in which a single compound serves as both oxidizing and...

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See “Effective Conductivity.”

The performance of the same overall protective function by a number of...

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The triggering of secondary events, such as toxic releases, by a primary...

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Time-integrated concentration

A method (developed by Dow Chemical Company) for ranking the relative fire...

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The surface stress, ôo, arises through direct viscous stress and through the...

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The negative of the temperature gradient established as dry air ascending in...

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Effective downward vertical velocity of small aerosols and gases if they are...

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A flame arrester that uses an element consisting of small gaps or apertures...

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DSC

Differential Scanning Calorimetry; A technique in which the difference of...

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DTA

Differential Thermal Analysis; A technique in which the temperature...

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The length of time for which the event state exists. Can be the repair time...

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Any finely divided solid, 420 microns or 0.017 inches, or less in diameter (...

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Consists of processor routines in conjunction with external hardware under...

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Models that predict effects of incident outcomes usually with respect to...

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For an incident that produces an incidnet outcome of toxic release, the area...

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The charging process in liquids of low conductivity alters the concentration...

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The spark ignition energy (J) of the least easily ignitable flammable...

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Defined as the vertical integral of the concentration-weighted wind speed,...

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A measure of the force exerted by one charged body on another. Imaginary “...

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Electromagnetic phenomena which, either directly or indirectly, can...

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The phenomenon of particle migration in an electric field.

An early device for generating charge by induction, attributed to and named...

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The portion of a graphical Language corresponding to an Instruction in...

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Pollutant releases at elevations above about 10 or 20 m.

Actions that should be taken at the time of a chemical exposure before...

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Maximum concentration levels that provide guidance in advance planning for...

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Process changes initiated by the operations staff to place the process into...

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A device that is designed to open during emergency or abnormal conditions to...

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